pentagon cleared general john allen of professional misconduct in exchanging e-mails with woman linked to the scandal that led general petraeus to rae sign as cia director. >> you can't see in front of you. can't see the cars. >> what it out conditions lead to 3 major car pileups in just ohio. more than 150 vehicle all tangled up. 133 million americans are experiencing the big chill. few are spared including fish. weather editor sam champion explains. >> to even the most winter aware. this arctic chill is for real. >> something to do to stay warm here. >> i feel in cold. yes. >> very cold. >> from minnesota to florida. more than a dozen states have winter weather advisory. with major city in the midwest either near or below zero on tuesday. and that wind chill? 50 below zero in maine to 10 below in north carolina. from the midwest to the northeast. it's the coldest air in two years. for most of the country it's a sudden and drastic change. in cedar rapid, iowa balmy 51 degrees saturday less than 48 hours later, it was 2 degrees below sear o. temperature swing of more than 53 degrees. >